JP2001096886A - Offset printed product for preventing copy or forgery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an offset printed product capable of preventing a forgery by a copy capable of identifying the copy from the product by obtaining a good sense of gloss and losing the sense of gloss when copied. SOLUTION: In order to assure smoothness by covering a surface of roughness of a paper texture of a sheet 1 such as woodfree paper or the like with a varnish ink or a medium ink to execute an underlay print 2, and a predetermined pattern is offset printed with an offset ink made of a pearl ink having a pearl pigment or a metallic ink having a metal powder of a content and a particle size capable of assuring flowability in a printer to obtain an offset printed product having a sense of gloss by projecting the particles 3 from the surface without embedding in a vehicle 4, but when the offset printed product is copied, the sense of gloss is lost due to the offset ink.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed matter for preventing a copy forgery by a copying machine, and more particularly to an offset printed matter for preventing a copy forgery in which a predetermined pattern portion by offset printing is viewed completely differently between the copied matter and the printed matter. About.

[0002]

2. Description of the Related Art Conventionally, when printing is performed using a pearl ink having a unique glossiness or a metallic ink having a metallic glossiness, the printed portion has a glossiness. It is not possible to copy and reproduce the copy, and the copy has lost its glossiness. Therefore, the copy and the printed matter are viewed completely differently, and a printed matter that prevents copy forgery is known. .

[0003]

By the way, the pearl ink obtained by mixing a pearl pigment with a vehicle, and the metallic ink obtained by mixing a metal powder with a vehicle, have a higher content of the pearl pigment or the metal powder. The larger the particle size, the better the glossiness. Conventionally, when used as a copy forgery prevention printed matter, the content is 70% or more by weight and the particle size is 25 microns or more.
Approximately 50 microns is required.

However, when pearl ink or metallic ink having such a content or particle size is used, printing can be performed by silk printing or gravure printing, which can increase the amount of ink, but ink flowability in a printing machine is poor. In offset printing, printing was not possible because it was not transferred to the paper surface. Therefore, in offset printing, the content of pearl pigments and metal powder was reduced, or the particle size was reduced,
It was necessary to use pearl ink and metallic ink.

For this reason, in conventional offset printing, as shown in FIG. 2, pigment particles 12 of pearl pigment or metal powder whose content is reduced or whose particle size is reduced are formed on paper 1.
Since the sheet 13 is buried in the first sheet and does not protrude from the surface of the vehicle 13, there is an inconvenience that glossiness cannot be exhibited. This disadvantage is particularly remarkable when printing is performed on high quality paper having a coarse grain.

The present invention solves such a conventional inconvenience and obtains a good glossiness in offset printing, thereby making it possible to visually distinguish a copy from a printed matter and prevent forgery by copying. It is intended to provide an offset printed matter.

[0007]

In order to attain this object, a copy forgery prevention offset printed matter according to claim 1 of the present invention is provided by covering the surface of a paper such as a high-quality paper with a coarse grain. By performing underprinting to ensure smoothness, by offset printing a predetermined pattern with an offset ink having a pearl pigment or metal powder of a content or particle size that can ensure fluidity in the printing press, This is to obtain a glossy offset printed matter.

[0008] Similarly, in order to achieve the above object, the copy forgery prevention offset printed matter according to the second aspect of the present invention is the same as the first aspect, except that the underprint for ensuring the smoothness of the paper surface is performed. The varnish ink or the medium ink is used, and a pearl ink or a metallic ink is used as an offset ink having a glossiness.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the cross-sectional view of the offset printed matter shown in FIG. 1 of the accompanying drawings.

As shown in FIG. 1, a copy forgery-preventing offset printed material covers the surface of paper 1 such as high-quality paper, covering the roughness of the paper, in other words, filling the irregularities on the surface of the paper 1 to provide smoothness. The underprint 2 is performed with a varnish ink or a medium ink in order to secure the printing quality. The underprint 2 is preferably provided on the entire surface of the sheet 1, but may be provided only on an offset printing portion of a predetermined pattern described later. Also, as the varnish ink, a known commercially available varnish for overprinting may be used, and as the medium ink, a known commercially available product may be used.

A predetermined pattern is offset-printed on two smooth underprinting surfaces with a pearl ink obtained by mixing a pearl pigment having a content and a particle diameter capable of ensuring fluidity in a printing machine with a vehicle 4. I have. As can be understood from FIG. 1, the underprinting 2 allows the pearl pigment pigment particles 3 to protrude from the surface of the vehicle 4 without being buried in the paper 1 of the paper 1, so that glossy offset printing is possible. Becomes

The predetermined pattern for offset printing may be any pattern such as various patterns and characters, and is not particularly limited. Further, the portion to be printed may be the entire sheet 1 or a part thereof. Further, offset printing may be performed on one part with pearl ink, and offset printing may be performed on another part with a normal colored ink for offset printing.

[0013] Pearl pigments are known in the art, such as natural pearl essence, mica powder, basic carbonate, fish scale foil, and a pearly luster formed by coating a core material of a granular material with a special substance. Pigments, for example, those obtained by coating the surface of mica powder with a metal oxide such as titanium dioxide may be used. Then, by controlling the thickness of the metal oxide, a pearl pigment having high iris reflectivity of an arbitrary color tone can be obtained.

In place of the pearl ink obtained by mixing the pearl pigment with the vehicle 4, a metallic ink having a metallic luster obtained by mixing a metal powder as the pigment with the vehicle 4 can be used. As this metallic ink,
For example, a gold ink can be obtained by using brass powder or yellow-colored aluminum powder. With this gold ink, different colors such as red mouth and blue mouth can be obtained depending on the zinc content in brass and the coloring of the aluminum foil.
When aluminum powder is used, a silver ink can be obtained. Also in this case, since the metal powder particles 3 are not buried in the paper grain but protrude from the surface of the vehicle 4, offset printing having a glossy feeling can be performed.

When the offset printed matter thus constructed is copied by a copying machine, the pearl luster of the pearl ink and the metallic luster of the metallic ink cannot be reproduced, so that it is easy to visually determine whether it is an original offset printed matter or a copied matter. Can be determined.

[0016]

As described above, according to the copy forgery prevention offset printed matter according to the first aspect of the present invention, a good gloss can be obtained, and the gloss is lost when copying is performed. Thus, it is possible to obtain an offset printed matter that can prevent forgery by copying.

According to the copy forgery prevention offset printed matter of the second aspect of the present invention, a good gloss can be obtained, and the gloss is lost when copying, so that the copy can be distinguished from the printed matter. In addition to obtaining offset printed matter that can prevent counterfeiting by copying, offset printing is easier and more reliable by applying underprinting with varnish ink or medium ink and using pearl ink or metallic ink as glossy offset ink This has the effect of further improving the glossiness.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an offset printed matter.

FIG. 2 is a cross-sectional view of a conventional printed material using a glossy offset ink.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper 2 Underprint 3 Pigment particle 4 Vehicle

Claims (2)

[Claims] 1. A copy forgery prevention offset printed matter, wherein a predetermined pattern is offset printed with a glossy offset ink after underprinting is performed on a paper surface to ensure smoothness. 2. A copy forgery according to claim 1, wherein underprinting is performed with varnish ink or medium ink to ensure smoothness on the paper surface, and pearl ink or metallic ink is used as a glossy offset ink. Offset printed matter for prevention.